Power Management Battery Management Battery Charger IC Linear Battery Chargers

LTC4361-1/LTC4361-2 - Overvoltage/Overcurrent Protection Controller

LTC4069-4.4 - Standalone 750mA Li-Ion Battery Charger in 2 × 2 DFN with NTC Thermistor Input

Features

  • Complete Linear Charger in 2mm × 2mm DFN Package
  • C/10 Charge Current Detection Output
  • Timer Charge Termination
  • Charge Current Programmable Up to 750mA with 5% Accuracy
  • No External MOSFET, Sense Resistor or Blocking Diode Required
  • NTC Thermistor Input for Temperature Qualified Charging
  • Preset 4.4V Float Voltage with 0.6% Accuracy
  • Constant-Current/Constant-Voltage Operation with Thermal Feedback to Maximize Charge Rate Without Risk of Overheating
  • Charge Current Monitor Output for Gas Gauging
  • Automatic Recharge
  • Charges Single-Cell Li-Ion Batteries Directly from USB Port
  • 20µA Supply Current in Shutdown Mode
  • Soft-Start Limits Inrush Current
  • Tiny 6-Lead (2mm × 2mm) DFN Package

Typical Application

LTC4069-4.4 Typical Application
LTC4069-4.4 Typical Application

Description

The LTC4069-4.4 is a complete constant-current/constant- voltage linear charger for high capacity single-cell lithium-ion batteries with a 4.4V float voltage. The 2mm × 2mm DFN package and low external component count make the LTC4069-4.4 especially well-suited for portable applications. Furthermore, LTC4069-4.4 is specifically designed to work within USB power specifications.

The CHRG pin indicates when charge current has dropped to ten percent of its programmed value (C/10). An internal timer terminates charging according to battery manufacturer specifications.

No external sense resistor or blocking diode is required due to the internal MOSFET architecture. Thermal feedback regulates charge current to limit the die temperature during high power operation or high ambient temperature conditions.

When the input supply (wall adapter or USB supply) is removed, the LTC4069-4.4 automatically enters a low current state, dropping battery drain current to less than 1µA. With power applied, LTC4069-4.4 can be put into shutdown mode, reducing the supply current to less than 20µA.

The LTC4069-4.4 also includes automatic recharge, lowbattery charge conditioning (trickle charging), soft-start (to limit inrush current) and an NTC thermistor input used to monitor battery temperature.

The LTC4069-4.4 is available in a tiny 6-lead, low profile (0.75mm) 2mm × 2mm DFN package.

 Float Voltage
LTC4069 4.2V
LTC4069-4.4 4.4V

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing		 RoHS
LTC4069EDC-4.4#PBF 2x2 DFN-6 DC6 E 05-08-1703 Yes
LTC4069EDC-4.4#TRMPBF 2x2 DFN-6 DC6 E 05-08-1703 Yes
LTC4069EDC-4.4#TRPBF 2x2 DFN-6 DC6 E 05-08-1703 Yes


LTC4069-4.4 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)		 Price
(1k)*		 RoHS
LTC4069EDC-4.4#PBF 2x2 DFN-6 E $1.65 Yes
LTC4069EDC-4.4#TRMPBF 2x2 DFN-6 E $1.66 $1.21 Yes
LTC4069EDC-4.4#TRPBF 2x2 DFN-6 E $1.65 $1.16 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards

Applications

  • Wireless PDAs
  • Cellular Phones
  • Portable Electronics

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